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Bluetooth with no aux input

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Evergreen72

New Member
I am currently working on a late 70s console. I would like to add bluetooth while continuing to use the original controls. Unfortunately, this model does not have an aux input. I would like to tap into the 8 track and repurpose it as bluetooth. I can't use the wires off the head because it runs through a preamp. Is there an easy way to identify the pre amp circuit?

Barring that is there a better way to do accomplish bluetooth using the original controls?
 
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What's the make and model of the console? Most consoles manufactured during that time period were modular, so the 8-track, including the head preamp, was its own module, and it should have a stereo line level output running to the main board. If the head preamp is actually built into the main system, there's a decent chance it uses the same preamp as the turntable (assuming there is one) but with a different EQ circuit.
 
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